Compound engine



3 Sheet-Sheet 1. J. 'F, HOLLOWAY. Compound Engine.

No. 224,779. I 1 P aten ted Feb. 24, I880.

ETERS, FHDTO-LITHDGRAPHER5 WASHINGTON, D C4 3 SheetsSh.e et 2 J. F. HOLLOWAY. Compound Engine.

No. 224,779. Patented Fe'b. 24,18801 N.PEIERS, PHOTO-LITHOGRAPHER. WASHINGTON. D. Q

Patented Feb. 24, 1880.

UNITED STATES PATENT Genres.

J OSEPHUS F. HOLLOWAY, OF CLEVELAND, OHIO.

COMPOUND ENGINE.

SPECIFICATION forming part of Letters Patent No. 224,779, dated February 24,. 1880.

Application filed December 31,1879.

in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to compound steamengines, and it is. designed as an improvement over an invention for which United States Letters Patent No. 158,378 were granted.

to me January 5, 1875. H p

This invention is intended to apply to that class of compound steam-engines wherein one cylinder is located. above the other, or placed 7 end to end, either in upright, horizontal, or inclined engines, one object being to do away with all intermediate heads or chambers between the high and low pressure cylinder, thus reducing the length of the steam-passages between the cylinders to the lowest possible limits, which feature, where the steam of one cylinder is dischargechdirectly into the other,

of the head between thetwo cylinders, also is one of too manifestimportance to require specific explanation.

Inthe drawings, Figure 1 is a vertical crosssection, showing the general arrangement of the steam-cylinders and heads, pistons and rods, and the stufling-boxes and crossheads.

Fi g. 2 is a side elevation of the steam-cylinders of my device, showing the detachable portion the exhaust-passage (shown in section) on one side for conveying the exhaust-steam from the small or high-pressure cylinder to thevalvechamber of the large or low-pressure cylinder. Fig. 3 is a top view of the large cylinderheads, together with the transverse section through the small or high-pressure cylinder, taken through the cylinder of the valve-chamber on the line a b, the other half being a section throughthe exhaust-passage lower down on the line 0 d. Fig. 4 is a view, in elevation, of the steam-cylinders on the valve-chambers side, showing an outside view of the passage for conveying the exhauststeam from the low-pressure cylinder.

lower end of the hi gh-pressure cylinder has a.

head, 0, cast in it, which also projects beyond the outside of the cylinder, thus forming a flange, O, which serves in part as a cover or crown for the low-pressure cylinder. tion of this flange or heachwhich is wanting, leaves an opening in the low-pressure cylinder. This opening may be round, oval, square, or, as shown in the drawings, the segment of a circle, and there is fitted to the flange of the high-pressure cylinder a separate plate, D, of metal, which, when in place, forms, together with the lower flange or head, 0, of the highpressure cylinder, a complete and perfect cover for the upper end of the low pressure cylinder.

The object and purpose of theremovable plate or part of the head just mentioned are to allow inspection of the interior of the lowpressure cylinder, and also any adjustment of the packing-rings, bolts, follower, &c.

The upper or high-pressure cylinder has, in addition to the usual steam-chest andsteamexhaust ports, one or more pipes or passages, E, cast on it, and in connection with its-lower head or flange, 0, through which the exhauststeam of the high-pressure cylinder may pass from under the exhaust-cavity of the main valve into the steam-chest of the lower or lowpressure cylinder, and these passages may also be used for the passage of steam direct from the boiler to the low-pressure cylinder. The high-pressure cylinder has also cast upon it two side pipes, channels, or guides, F, in line with the axis of its bore, through which the two piston-rods G, which connect with the piston-head B of the low-pressure cylinder, pass to connect with the cross-head of the upper or high-pressure cylinder. These passages may be bored out, or they may be lined with Babbitt or other equivalent metal, and are intended to serve as guides for the two pistonrods along the sides of the steam-cylinder,

A por- The top head or crown of the high-pressure passages, one or more passages, E, cast on the upper end, and so arranged as to come opposite to the steam-openings in the abutting end of thehigh-pressure cylinder, and which, in connection with these openings, form a continuous passage from the exhaust-ports of the high-pressure cylinder to the steam-chest of the low-pressure cylinder in the shortest and most direct manner.

The lower head of the low-pressure cylinder has two stufflng'boxes placed in line withthe piston-rods from the low-pressure piston to the lower cross-head of the engine, which stufling boxes may be cast into the head, or may be made separately and bolted on it. There are also formed or attached three or more female screw-threads, H, extending only through the lower head of the high-pressure cylinder.

J ack-screws may be introduced at these points, and may serve to raise up the highpressure cylinder and superincumbent parts far enough to allow taking out the pistonhead, packing, &c., or to permit any examination or repairs that may be required.

The removable portion D of the lower head of the high-pressure cylinder is provided with a raised flange, M, which is seated against a raised flange, M, formed on the main portion of the piston head and secured thereto by bolts m. This construction en ables the removable portion D to be secured in place by bolts located wholly outside of the low-pressure cylinder, and, further, furnishes a flat bearing for the interposition of packing, which will not be seriously impaired by the action of th e steam, as said packing is located outside of the steamcylinders. By casting the guide tubes or pipes solid with the lower head and cylinder of the high-pressure cylinder I am enabled to dispense with stuffing-boxes or glands for the piston-rods at the openings in the low-pressure cylinder, and thus locatc.the piston-rods in close proximity to the high-pressure cylinder.

What I claim is v 1. In a compound engine, the high-pressure cylinder constructed with the lower head cast solid with the cylinder and adapted to form the upper head of the low-pressure cylinder, said double eylinder-head formed with a removable portion, D, having araised flange, M, which seats against a raised flange, M, formed on the main portion of the cylinder-head, and is secured thereto by bolts m, substantially as set forth.

2. In a compound engine, the high-pressure cylinder constructed with the lower head cast solid with the cylinder and adapted to form the upper head of the low-pressure cylinder, the high-pressure cylinder having piston-rod guide pipes or tubes cast solid therewith, in combination with the piston-rods attached to the piston of the low-pressure cylinder and the removable head of the high-pressure cylinder, the latter seated against the outer ends of said guide pipes or tubes, substantially as set forth.

3. In a compound engine, the combination with the high-pressure cylinder having an exhaust-steam passage formed therewith and in the same casting, the outer end of said passage terminating in the lower head of the highpressure cylinder, of the lmv-pressure cylinder provided with an exhaust-steam passage formed therewith in casting, the outer end of said passage arranged to register with the ex haust-steam passage formed in the lower head of the high-pressure cylinder, substantially as set forth.

4;. Three or more female screw-threads, H, in combination with but one of the flanges of adjacent cylinder or cylinder-heads, wherein jack-screws may be turned to separate and raise. up one of the cylinders, substantially as and for the purpose shown.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPHUS F. HOLLOWAY.

Witnesses:

WILLARD FRAoKER, JNo. ORowELL, Jr. 

